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Method and apparatus for stabilizing the measurement of CT numbers

  • US 6,748,043 B1
  • Filed: 10/18/2001
  • Issued: 06/08/2004
  • Est. Priority Date: 10/19/2000
  • Status: Expired due to Fees
First Claim
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1. A method of stabilizing the calculation of CT (computed tomography) numbers by a CT system, the CT system including an x-ray source for generating x-rays in response to a voltage supplied by a voltage source, the method comprising:

  • a) calculating the CT number of a sample having a known CT number value;

    b) adjusting the voltage supplied by the voltage source to a reference level for which the calculation in step (a) yields said known CT number value; and

    c) measuring the energy spectrum of the x-rays generated by the x-ray source;

    d) adaptively regulating the voltage based on the spectrum measured in step (c), so as to prevent any deviation in the voltage from said reference level determined in step (b); and

    e) maintaining the voltage substantially constant at said reference level by repeating steps (c) and (d) during subsequent CT number measurements by said CT system.

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